# WAC 51-51-0102: WAC 51-51-0102. Section R102 — Applicability

> Washington · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0102

## Section

- **Citation:** WAC 51-51-0102
- **Heading:** WAC 51-51-0102. Section R102 — Applicability
- **Jurisdiction:** Washington
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Washington Administrative Code / Title 51 / Chapter 51-51 / Section 51-51-0102

## Text

R102.5 Appendices. Provisions in the appendices shall not apply unless specifically referenced in the adopting ordinance. An appendix adopted by a local jurisdiction shall not be effective unless approved by the state building code council pursuant to RCW 19.27.060 (1)(a).
EXCEPTIONS:
1. The state building code council has determined that a local ordinance providing specifications for light straw-clay or strawbale construction, requiring a solar-ready zone, requiring fire sprinklers, or addressing construction and demolition material management or building deconstruction in accordance with Appendix AR, AS, AT, AWV, AWY, or AWZ of this code may be adopted by any local government upon notification of the council.
2. Appendix AF, Radon Control Methods, Appendix AQ, Tiny Homes, and Appendix AWU, Dwelling Unit Fire Sprinkler Systems, are included in adoption of the International Residential Code.
R102.7.1 Additions, alterations, change of use, repairs, or relocations. Additions , alterations , repairs , or relocations shall be permitted to conform to the requirements of the provisions of Chapter 45 or shall conform to the requirements for new structure without requiring the existing structure to comply with the requirements of this code, unless otherwise stated. Additions , alterations , repairs , and relocations shall not cause an existing structure to become less compliant with the provisions of this code than the existing building or structure was prior to the addition , alteration , repair , or relocation. Where additions , alterations , or changes of use to an existing structure result in a use or occupancy, height, or means of egress outside the scope of this code, the building shall comply with the International Existing Building Code .
EXCEPTIONS:
1. Additions with less than 500 square feet of conditioned floor area are exempt from the requirements for Whole-House Ventilation Systems, Section M1505.4.
2
ditions , alterations , or changes of use to an existing structure result in a use or occupancy, height, or means of egress outside the scope of this code, the building shall comply with the International Existing Building Code .
EXCEPTIONS:
1. Additions with less than 500 square feet of conditioned floor area are exempt from the requirements for Whole-House Ventilation Systems, Section M1505.4.
2. Additions or alterations to existing buildings which do not require the construction of foundations, crawlspaces, slabs or basements shall not be required to meet the requirements for radon protection in Section R332.1 and Appendix AF.
R102.7.2 Moved buildings. Buildings or structures moved into or within a jurisdiction shall comply with the provisions of this code, the International Building Code (chapter 51-50 WAC), the International Mechanical Code (chapter 51-52 WAC), the International Fire Code (chapter 51-54A WAC), the Uniform Plumbing Code and Standards (chapter 51-56 WAC), and the Washington State Energy Code (chapter 51-11R WAC) for new buildings or structures.
EXCEPTION:
Group R-3 buildings or structures are not required to comply if:
1. The original occupancy classification is not changed; and
2. The original building is not substantially remodeled or rehabilitated. For the purposes of this section a building shall be considered to be substantially remodeled when the costs of remodeling exceed 60 percent of the value of the building exclusive of the costs relating to preparation, construction, demolition or renovation of foundations.

## Nearby sections

- [WAC 51-51-001 WAC 51-51-001. Authority](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_001.md)
- [WAC 51-51-002 WAC 51-51-002. Purpose](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_002.md)
- [WAC 51-51-003 WAC 51-51-003. International Residential Code](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_003.md)
- [WAC 51-51-007 WAC 51-51-007. Exceptions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_007.md)
- [WAC 51-51-008 WAC 51-51-008. Implementation](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_008.md)
- [WAC 51-51-0102 WAC 51-51-0102. Section R102 — Applicability](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0102.md)
- [WAC 51-51-0202 WAC 51-51-0202. Section R202 — Definitions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0202.md)
- [WAC 51-51-0301 WAC 51-51-0301. Section R301 — Design criteria](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0301.md)
- [WAC 51-51-0302 WAC 51-51-0302. Section R302 — Fire-resistant construction](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0302.md)
- [WAC 51-51-0303 WAC 51-51-0303. Section R303 — Light, ventilation and heating](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0303.md)
- [WAC 51-51-0307 WAC 51-51-0307. Section R307 — Toilet, bath and shower spaces](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0307.md)
- [WAC 51-51-0309 WAC 51-51-0309. Section R309 — Garages and carports](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0309.md)
- [WAC 51-51-0311 WAC 51-51-0311. Section R311—Means of egress](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0311.md)
- [WAC 51-51-0312 WAC 51-51-0312. Section R312 — Guards and window fall protection](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0312.md)

---

Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_51_51_0102. Check the current official text before relying on it. Not legal advice.